Electrochemical dechlorination of chloroform in neutral aqueous solution onpalladium/foam-nickel and palladium/polymeric pyrrolefilm/foam-nickel electrodes
SUN Zhirong , LI Baohua , HU Xiang , SHI Min , HOU Qingnan , PENG Yongzhen
DOI:
Received May 22, 2007,Revised July 20, 2007, Accepted , Available online
Volume 20,2008,Pages 268-272
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Electrochemical dechlorination of chloroform in neutral aqueous solution was investigated using palladium-loaded electrodes
at ambient temperature. Palladium/foam-nickel (Pd/foam-Ni) and palladium/polymeric pyrrole film/foam-nickel (Pd/PPy/foam-Ni)
composite electrodes which provided catalytic surface for reductive dechlorination of chloroform in aqueous solution were prepared
using an electrodepositing method. Scanning electron microscope (SEM) micrographs showed that polymeric pyrrole film modified
the electrode-surface characteristics and resulted in the uniform dispersion of needle-shaped palladium particles on foam-Ni supporting
electrode. The experimental results of dechlorination indicated that the removal e ciency of chloroform and current e ciency in neutral
aqueous solution on Pd/PPy/foam-Ni electrode could be up to 36.8% and 33.0% at dechlorination current of 0.1 mA and dechlorination
time of 180 min, which is much higher than that of Pd/foam-Ni electrode.
